libgcc_s.so "Use the shared library..."

[Florian Weimer]

* Christer Solskogen via Gcc-help:

> "but some functions are only in the static library."
>
> How come? Are there functions that can only exist in a static library?

Yes, some functions are always called through local calls, e.g. the
outline atomics helpers on AArch64.  In these cases, the definition
cannot reside in a different object.

Thanks,
Florian